The FBI earlier this month made available more than 2,000 government documents in the Vault. Although the information was available before, it was not all digitized or easily searchable online as it is now.

The documents cover a wide variety of topics. For example, famous Kentucky Fried Chicken icon Colonel Sanders received mostly positive correspondence, but he received one letter that said he was "in grave danger of being murdered," which can be read in a recently opened government document online.

The Vault also shares a great deal of information on Utah, including an arrest warrant on Ted Bundy and specifics about UFO sightings.

Mail Online said, "Another secret document released as part of the projects detailed how police and Army officers witnessed a UFO exploding over Utah in April 1949."

One document tells about "three different Utah men who spotted a strange light and object above the mountains southwest of Logan."

And there are many other documents about UFO viewings. Yahoo News said that former FBI chief J. Edgar Hoover received a letter about an alleged alien landing. The letter says, "An investigator for the Air Force stated that three so-called flying saucers had been recovered in New Mexico. They were described as being circular in shape with raised centers, approximately 50 feet in diameter. Each one was occupied by three bodies of human shape but only 3 feet tall, dressed in metallic cloth a very fine texture."